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11. 发明专利

JPH11204865A OPTICAL AMPLIFIER 失效
公开(公告)号：JPH11204865A
公开(公告)日：1999-07-30
申请号：JP463898
申请日：1998-01-13
申请人： MITSUBISHI ELECTRIC CORP
发明人： ISSHIKI KUNIHIKO , YAMAGUCHI SHOICHIRO , WATANABE HIROMITSU , YAMASHITA JUNICHIRO , KOGURE TAICHI
IPC分类号： H01S3/07 , H01S3/06 , H01S3/10 , H01S3/17
摘要： PROBLEM TO BE SOLVED: To reduce gain deviatoin in a wide wavelength range, by installing an optical amplifying part where an Er added quartz based glass optical fiber which is pumped at a specified pumping wavelength and has Al coactivation concentration of a specified value, and an Er added fluoride glass optical fiber or the like which is pumped at a specified pumping wavelength are cascaded. SOLUTION: An optical amplifying part where an Er added quartz based glass optical fiber (EDF) 1 which is pumped at a pumping wavelength of 0.98 μm band and has Al coactivation concentration of at least 4 wt.%, an Er added fluoride glass optical fiber (F)1 which is pumped at a pumping wavelength of 1.48 μm band, and a EDF3 which is pumped at a pumping wavelength of 1.48 μm band and has Al coactivation concentration of at most 2 wt.% are cascaded is installed. A pumping light 9 outputted from a pumping light source 6 is inputted in the F1 and the EDF3, and a light of 1.5 μm band is amplified. A pumping light 9a outputted from a pumping light source 6a is inputted in the EDF2, and a light of 1.5 μm band is amplified. A signal light 8a whose wavelength is 1.5 μm band is amplified through the EDF2, the F1 and the EDF 3 in order, and a signal light 8b is outputted.

12. 发明专利

JPH11135865A OPTICAL AMPLIFIER 失效
公开(公告)号：JPH11135865A
公开(公告)日：1999-05-21
申请号：JP29822097
申请日：1997-10-30
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI , YAMASHITA JUNICHIRO , WATANABE HIROMITSU , ISSHIKI KUNIHIKO
IPC分类号： G02B6/00 , H01S3/06 , H01S3/10 , H04J14/00 , H04J14/02
摘要： PROBLEM TO BE SOLVED: To provide an optical fiber having a desired gain-wavelength characteristic by changing the power ratio between stimulating light inputted from one end of a doped fiber and stimulating light inputted from the other end of the fiber through the use of a 2×2 branching coupler having a different branching ratio. SOLUTION: When a branching ratio R'a: R'b of a second 2×2 branching coupler 9 of an optical amplifier is get to 80:20, an exciting state which is asymmetrical with respect to the center line can be realized, because the variations of the stimulating light in the same direction can be made smaller, and the variations of stimulating light in an opposite direction can be made larger, in such a way that the relation between the photoelectric power P'aout and P'bout of stimulating lights 23a and 23b and the photoelectric powers Pa1n and Pb1n of stimulating lights 21a and 21b become such that the photoelectric power P'aout of the stimulating light 23b becomes 80-100 mW and P'aout of the stimulating light 23b becomes 20-100 mW, when the photoelectric power Pb1n of the stimulating light 21b is changed from 0 mW to 100 mW. Since the asymmetrical exciting state can be realized by respectively inputting stimulating light from the higher and lower branching-ratio output terminals of the coupler 9 to the signal inputting and outputting side of a doped fiber, a desired gain-wavelength characteristic can be obtained.

13. 发明专利

JPH09293922A LIGHT AMPLIFIER 失效
公开(公告)号：JPH09293922A
公开(公告)日：1997-11-11
申请号：JP10553296
申请日：1996-04-25
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI , NAKAMURA TAKESHI
IPC分类号： G02F1/35 , H01S3/06 , H01S3/07 , H01S3/094 , H01S3/10 , H01S3/131 , H01S3/16 , H04B10/29 , H04B10/294 , H04B10/16 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To obtain a light amplifier whose gain is enhanced in stability in a wide range of temperature without controlling it with a complicated electronic circuit, by a method wherein exciting light emitted from an exciting light source is made to impinge on an optical fiber through the intermediary of a temperature compensator. SOLUTION: A temperature compensator 11 is disposed between an optical multiplexing/branching device 2 and an exciting light source 3. Exciting light emitted from the exciting light source 3 is made to excite a doped fiber 1 through the intermediary of the temperature compensator 11 and the optical multiplexing/branching device 2 shown by a broken line. On the other hand, signal light inputted through an input terminal 9 shown by a solid line is inputted into the doped fiber 1 through a first optical isolator 4, amplified by the doped fiber 1 optically excited, and taken out through an output terminal 10 through the intermediary of the optical multiplexing/branching device 2. When an ambient temperature varies, the temperature compensator 11 is so changed in insertion loss as to cancel a gain change in the doped fiber 1 to keep an optical amplifier of this constitution constant in gain.

14. 发明专利

JP2002208713A OPTICAL RECEIVER 失效
公开(公告)号：JP2002208713A
公开(公告)日：2002-07-26
申请号：JP2001003062
申请日：2001-01-10
申请人： MITSUBISHI ELECTRIC CORP
发明人： TOTSUKA YOJI , KOGURE TAICHI , MOTOJIMA KUNIAKI
IPC分类号： H01L31/0232 , H04B10/079 , H04B10/40 , H04B10/50 , H04B10/60 , H04B10/67 , H04B10/04 , H04B10/06 , H04B10/14 , H04B10/26 , H04B10/28
摘要： PROBLEM TO BE SOLVED: To obtain an optical receiver including a PD for observing light intensity. SOLUTION: In the same optical receiver 100, an avalanche photodiode 1 and a photodiode 8 are arranged in parallel on a carrier 2, and a branching means 10 is arranged, so that an incident optical signal is branched, and the branched optical signals are made to enter the avalanche photodiode 1 and the photodiode 8, respectively. A current signal converted with the avalanche photodiode 1 is led out as a signal current from a signal current output terminal 7, and a current signal converted with the photodiode 8 is led out as a monitor current from a monitor current output terminal 9.

15. 发明专利

JP2002162610A VARIABLE OPTICAL FILTER AND INTENSITY RATIO VARIABLY SEPARATING DEVICE 失效
公开(公告)号：JP2002162610A
公开(公告)日：2002-06-07
申请号：JP2000361794
申请日：2000-11-28
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI
IPC分类号： G02F1/09 , G02B27/28 , G02F1/313
摘要： PROBLEM TO BE SOLVED: To provide an intensity ratio variably separating device which can be driven with a low voltage, in which high reliability can be obtained and also the character of a loss wavelength having an arbitrary and complex form can be obtained. SOLUTION: A first collimating lends 3a aligns incident rays of light from an input terminal 1 to parallel beams, a variable Faraday rotator 8 performs control for rotating arbitrarily polarization planes of the incident parallel beams and a first double refraction plate 10a separates the beams into an ordinary ray L1 and an extraordinary ray L2 whose intensity ratios are changed in accordance with angles of the polarization planes of the incident rays of light. A glass plate 4 makes the rays of light cause Mach-Zehnder interference by transmitting a part of the ordinary ray L1, and then the rays of light are collected by a second double refraction plate 10b and a second collimating lends 3b, and outputted to an output terminal 2.

16. 发明专利

JP2002122896A RAMAN AMPLIFIER 失效
公开(公告)号：JP2002122896A
公开(公告)日：2002-04-26
申请号：JP2000312039
申请日：2000-10-12
申请人： MITSUBISHI ELECTRIC CORP
发明人： SUZUKI MASAO , SHIMIZU KATSUHIRO , KOGURE TAICHI
IPC分类号： G02F1/35
摘要： PROBLEM TO BE SOLVED: To suppress PDG that becomes one of the causes of the degradation in transmission characteristics of a Raman amplifier. SOLUTION: In the amplifier, the transmission loss of signal light beams propagated through a transmission path is compensated for by a Raman amplification effect of stimulated light beams inputted to the path from a stimulating light source. The source is provided with a semiconductor laser which outputs light, a polarization holding fiber which propagates the outputted light of the laser for longer than a prescribed length in two polarization modes that have a propagation constant difference and are mutually orthogonal and a stimulated light source outputting port which outputs the output light propagated through the fiber as stimulated light to be inputted to the transmission path.

17. 发明专利

JP2002006348A OPTICAL AMPLIFIER 失效
公开(公告)号：JP2002006348A
公开(公告)日：2002-01-09
申请号：JP2000186396
申请日：2000-06-21
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI
IPC分类号： G02B5/28 , G02B5/18 , G02F1/35 , H01S3/06 , H01S3/094 , H01S3/30
摘要： PROBLEM TO BE SOLVED: To obtain an optical amplifier for controlling gain saturation caused by generation of Stokes rays of 2nd order or higher. SOLUTION: By arranging a filter 7 for cutting off Stokes rays of 2nd order or higher between optical fibers 3a and 3b for a Raman amplifier, the Stokes rays of 2nd order or higher generated from the optical fiber 3a for the Raman amplifier are prevented from being propagated into the optical fiber 3b for the Raman amplifier.

18. 发明专利

JP2006325124A OPTICAL RECEIVER 审中-公开
公开(公告)号：JP2006325124A
公开(公告)日：2006-11-30
申请号：JP2005148349
申请日：2005-05-20
申请人： MITSUBISHI ELECTRIC CORP
发明人： SHIMOMURA KENKICHI , SHIMIZU KATSUHIRO , KOGURE TAICHI
IPC分类号： H04B10/40 , H04B10/07 , H04B10/50 , H04B10/516 , H04B10/524 , H04B10/548 , H04B10/60 , H04B10/61 , H04B10/67
摘要： PROBLEM TO BE SOLVED: To obtain an optical receiver capable of optimally controlling MZI (Mach Zehnder interferometer) passing waves without deteriorating receiving characteristics and without using a high-speed electrical circuit. SOLUTION: The optical receiver for receiving an optical DPSK (differential phase shift key) signal that is differentially encoded by a one-bit delay amount is provided with an optical branching circuit 10 for branching the received optical DPSK signal, a Mach Zehnder interferometer 20 in which a relative delay amount between arms is 1/2 bit and which converts the optical DPSK signal branched by the optical branching circuit 10 into an intensity modulation signal, an optical branching circuit 40 for respectively returning two optical outputs of the Mach Zehnder interferometer 20 and respectively branching a portion of the two optical outputs, a wavelength deviation detection circuit 50 for detecting an output difference between optical power of the two optical outputs branched by the optical branching circuit 40, and a control circuit 60 for controlling the passing wavelength of the Mach Zehnder interferometer 20 on the basis of the output difference between the two optical power detected by the wavelength deviation detection circuit 50. COPYRIGHT: (C)2007,JPO&INPIT

19. 发明专利

JP2003258739A WAVELENGTH MULTIPLEXED OPTICAL AMPLIFICATION RELAY TRANSMISSION SYSTEM 审中-公开
公开(公告)号：JP2003258739A
公开(公告)日：2003-09-12
申请号：JP2002057745
申请日：2002-03-04
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI , TOKURA TOSHIYUKI , MOTOJIMA KUNIAKI
IPC分类号： H01S3/06 , H01S3/067 , H01S3/10 , H04B3/46 , H04B3/48 , H04B10/07 , H04B10/079 , H04B10/2543 , H04B10/29 , H04B10/294 , H04B17/00 , H04J14/00 , H04J14/02 , H04B10/16 , H04B10/08 , H04B10/17
摘要： PROBLEM TO BE SOLVED: To provide a wavelength multiplexed optical amplification relay transmission system in which a quantity of the change in a transmission quality caused by the relation of the operating point of an input light intensity to an optical submarine repeater on the basis of loss variation is guaranteed by a variable attenuator. SOLUTION: A wavelength multiplexed optical signal transmitted from an optical transmitter 1 is demultiplexed and received by an optical receiver 2, a signal light power monitor 10 measures a receiving level for each wavelength, and abnormality in an optical transmission line 3 or in an optical amplification repeater 4 is detected. The inclination of each wavelength measured by the signal light power monitor 10 with respect to the wavelength of a signal light power is calculated, an inclination increment/decrement quantity as a compared value with the inclination of reference data measured in normal operation is found and when the inclination increment quantity exceeds a threshold, the variable attenuation quantity value of a variable optical attenuator 5 is equally distributed from the inclination increment/ decrement quantity and the characteristics of the optical amplification repeater 4 and simultaneously adjusted to all the variable optical attenuators 5. Afterwards, the spot of fault occurrence is specified and the attenuation quantity of the respective variable optical attenuators 5 is reset to be optimal conditions for all the variable optical attenuators 5. COPYRIGHT: (C)2003,JPO

20. 发明专利

JP2002082321A VARIABLE OPTICAL FILTER 失效
公开(公告)号：JP2002082321A
公开(公告)日：2002-03-22
申请号：JP2000273766
申请日：2000-09-08
申请人： MITSUBISHI ELECTRIC CORP
发明人： KOGURE TAICHI
IPC分类号： G02B5/30 , G02F1/015 , H01S3/10 , H01S5/50
摘要： PROBLEM TO BE SOLVED: To realize light-speed operation and flexible variable light equalization operation setting the wavelength characteristic of loss in a characteristic having an optional shape. SOLUTION: The variable optical filter is provided with a polarized light separator 6 for polarizing and separating light made incident from an input terminal, two semiconductor optical amplifiers 11a, 11b with gain and the wavelength dependency of the gain changed by injection currents and temperature, current injection parts 12a, 12b and temperature control parts 13a, 13b for individually controlling the gain of the amplifiers 11a, 11b and the wavelength dependency of the gain, by controlling injection currents to the amplifiers 11a, 11b and the operation temperature of the amplifiers 11a, 11b, and a polarized wave multiplexer 10 for polarizing and multiplexing respective light components, outputted from the amplifiers 11a, 11b and outputting the multiplexed light from an output terminal 2.

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